In the Canadia mirages I've driven, the speedo's read faster than reality meanwhile a scan tool reads the correct speed. So our speedo's are inacurate. I've never actually tested the odometer accuracy. It's close enough for me. Running the 175's brings my speedometer closer to reality but not close enough to be correct. I assume this is mainly an issue with the canada mirages. And those bizarre places where it's mandatory to only sell cars with the don't read the correct speed.
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View my fuel log 2014 Mirage SE wussie cvt edition. 1.2 automatic: 37.7 mpg (US) ... 16.0 km/L ... 6.2 L/100 km ... 45.3 mpg (Imp)